Ventilated laminated core for dynamo-electric machines.



No. 890,577. PATENTED JUNE 9, 1908.

W. J. RICHARDS. VENTILATED LAMINATED GORE FOR DYNAM O ELECTRIC MACHINES.

APPLICATION FILED OCT. 81, 1906.

2 SHEETESEEBT 1..

IIHI Ii I :9 \IIIINIHHHIHIIEIIIIIIIIHNIIII QEWYG PN 6k PATENTED JUNE 9, 1908.

I W: J. RICHARDS. VENTILATED LAMINATED GORE FOR DYNAMO ELECTRIC MACHINES.

ilPLIOATIOH FILED OGT.31,1906

Z SHEETSSHEET or apparatus and To all whom it may concern:

1 UNITED sTATns PATENT OFFICE.

WALTER '5. RIOHRDS, OF

NORWOOl), onio, ASSIGNOR ro OORFORATION or uswosnsirr.

ALLIS-GHALMERS COMPANY, A

i VENIFILATED LAMINATED FOR DYNAMQ ELECIRIC MACEENES.

short by brass separators in the form of brass se crstors are szeleton rings or segments. It is essential thet the ribs of the separators be this so cs to interfere as little as ossihle with the proper circulation of the coo ing air 01" rents. These therefore diilic" it to csshenc expensive, and in cores of large diameter having separators consisting of c lar enumber of segments, considerable time not labor is required to match and assemble the segments.

.The object of my invention is to disoense with the separators heretofore employed and still obtain sufficient ventilation tnrough the cores.

In carrying out my invention, 1 provide transverse or radial ventilating passageways in a core huilt'uo entire! of list laminse.

, More specifics ly consiocred my invention consistsin acore for dynamo-electric Inachmes comprising main laminae and groups of special venl'llc ttiir laminae arranged at intervals between the main laminae, the special ventilating laminae having overleppingopenings through which air may pass.

Myinvention still "further comprises certil-in details. of construction and combine tions end arrangements of ports described in the s ecificetion and set forth in the upiende claims.

- or a better understanding of my invention reference is had to the sccom mnying drswin s forming a part of this application, in whic 1 Figure 1 is a. partial longitudinal section throu h a machine equippc with my invention; l ig. 2 1s a. sectionthrough the armsture' core, the section being taken along the line 2-,2 of 1 looking in the direction of the arrow; Fig. 3 1m partial elevation of Specification Letters Patent.

Application. filed bctober 31, 1906. Serial No. 341,374.

.is csimila-r view of a sh ht longitudinal core constructed according to Petsz ifed June 9, 1908 one of the special ventilstingleminae; Fig. 4 modification oi the some Fig. 5 is e simi or View of a second s'jecisl ventilating lamina employed in conjunction with the lamina. shown in Fig. 3 or Fig. 4; Figifi is a similar view of one of-the Y .18 :2. partial laminae oi the core; Fig.

section through c rotor having o; my invention, mounted on a. spider; Fig. 8 is a martial transverse section of the some along tc line 8-8 of Fig. 7, looking in the direction of the arrow; Fig. 9 is .9. partial longitudinal section through c stetor core equipped with in invention; and Fig. 10 is spnrtisd transverse section elong the line -10 of Fig. 9,

looking in the direction of the arm.

My invention may be applied to cores of any diameter, built up of either circular disks or segments, or to either rotary or ststioncry cores. 1

' In all modifica ions of my invention, for

each ventileting iesssgewsy, I employ two special forms or lUIlLlS of lcminm errenged in two or more groups, which are preferably adjacent one another, one group or groups of the laminae having openings or slots open ct the periphery of the core and the othergrouo or groups having openings or slots whic. overlap the openings or slots in the first mentioned group or groups and which are either open at the opposite periphery of the core-or communicate with loiigituclinel passageways open at the ends of the machine.

Reference is first had to li i s. 1 to 6 of which Figs. 1 and 2 show it machine of smell size having on armature core built up of lsminzc in the form of disks mounted directly 3 to 6 show laminae adapted to be employcd therein. At 10 is shown on armature shaft on which is mounted on armature i1 and commutator 12. Surrounding the cron the shaft. end of which Figs. portions of the mature is e stationary field member hevingfield poles, one of which is shownst 13. The lamina: of the armature are clamped between end-members 14 and 15, the former of which bears against av shoulder 16 on the shaft and the letter of which bears against a clsmoin ring 17. The core is slotted in the usual manner and-carries an armature Wind ing connected to the. bars of the commutator.

it is to be understood however thst'iny in vention is applicable to alternating current machines as Welles to direct currentmclating laminae 19, and special ventilating laminae 20. The main lamina 18 form the largest portion of the core. These laminae, one of which is shown in Fig. 6, are of the usual shape. They are provided with. pe ripheral slots 21, to receive the armature conductors, teeth 22, ventilating openings 23, and a shaft opening 24. The ventilating laminae are arranged between the main laminae at one or more points so as to form radial 0r transverse ventilating passageways or spaces. For each transverse ventilating passageway there are one or more groups of lamina 19 and one or more adjacent groups of laminae 20. In Fig. 1, I have shown for each ventilating passageway two groups of laminae 19 and an intermediate group of laminae 20. Each lamina It? is provided at its periphery with slots and teeth the same as the main laminae, and with a number of open-- ings or slots 25 which communicate with the openings 23 and extend outward toward the periphery of the lamina, the slots being separated by radial fingers '26. These openings 25 may be open at the inner periphery of the lamina as is shown in Figs. 1' and 3 or may be closed. The latter form is shown in Fig. 4,

' the lamina 19 'having closed openings or slots 25 which serve the same purpose as the openings or slots 25 in lamina 19. The laminae 19 provide greater heat radiating surface but the long teeth 26 may be bent or twisted. The latter objection is overcome with the form of lamina shown in Fig. 4. In larger machines, however, in which a circulation of air is dcsiredilirectly through the core from one peri hery to the other, the slots must be opfin he ventilating laminae 20, one of w 'ch is shown in Fig. 5, adjacent the lamina 19 are provided at their outer peripheries with slots 27 doe er and wider than the slots 21 in the other Faminm, and with long and narrow teeth 28 of the same number as the teeth in the other laminae. The body of each lamina 20 is similar to the body of the main laminae 18, having ventilating openings 23 which communicate with the ventilating 0 enings in the main laminae, The depth of tie slots or openings 27 is such that, when the laminae are assembled, the slots 27 in laminae 20 overlap the slots or openings 25 or '25 in the laminae 19 or 19. The ventilating openings 23 in the disks form the usual longitudinal ventilating openings 20 through the core, the'end-mcm ers being provided. with openings which permit air to he drawn into the machine.

By referring to Figs. 1 and 2, it is seen that when the machine is in operation air is drawn into the longitudinal passageways .30, and passes first to the 0 innings 25 in laminae 19, then into the over lapping openings 27 in laminai 20, and out of the machine through the openings between the teeth 28 and the conductors in the slots 21.

The number oi ventilating laminae in each group may be varied at will and depends generally on the size of the machine or the volume of air re uired. Also the relative arrangements of t .e ventilating laminae may be varied. For example there may be for each ventilating passageway, a single group of laminae 19 between two groups of laminae 20, or a single group of lain-'nae 19 and a single group of laminae 20, a will up ear from the following .description and ilustration. It is not necessary that the two groups of special ventilating laminae be adjacent, but all that is necessary is-that the .openings in one group communicate with the openings in another. Accordingly the two groups of laminm may be separated by other laminae having openings to permit the air to pass from the openings in one group to the openings in the other.

Referring to Figs. 7 and 8, it is seen that I have shown niy invention applied to a larger type of machine.

In this case the core is. built up of segments of laminae which are dove-tailed to the arms of a spider 30. There ventilating segments 32 haveopenings or pas- I sageways 34 which correspond with openings,

25 or 25 of the disk'laminae 19 or 19 firstdescribed, and segments 33 have openings 35 which correspond with the openings-or slots 27 in disk-laminse 20. In this case, I have for each transverse ventilating passageway two groups of segments 33 and an intermediate group of segments 32. With this arrangement, air passes from the longitudinal passageways 36 into the openings or slots 34 of segments 32, then into the openings or slots 35 in the two groups of segments 33, and

then out of the core at itsouter periphery,

If desired the openings orslots 34 may be open at the inner periphery of the core between the arms of the spider so that air may pass directly through the core from the inner to the outer peripher In Figs. 9 and 10 I iaveshow'n a portion of a stator core equipped with my invention. In this case, the laminae of the core are built up of segments dove-tailed to the outer 81.11"". rounding stator frame 37. As in the preceding cases the core consists of main segments of laminae 38 of the ordinary form, and groups of the special ventilating segments of laminae 39 and 40 arranged at intervals between the main segments. The segments 39 have openings or slots 41 which are open at the outer periphery of the core and the adj acent segments 10 have openings or slots 42 which overlap the slots 41 and which are open at the inner periphery of the core. It is seen that air Wlll be forced by the rotor into the openings 42 of segments then into 0 enings 41 of segments 39, and then out t ough the stator frame. In this case I have shown only a sin le group of segments 39 and a single group 0 segments 40 for each transverse ventilating passageway. If desired, however, different arrangements as shown in the preceding figures may be employed. K

It is apparent that Ihave provided means .for securing good ventilation through the cores of machines of any typewithout employing spacing means-heretofore employed, ut the ventilating air currents pass entirely through llux carrying laminae. It is also apparent that the dillerent forms and arrangements of the special ventilating laminae may be'widely varied.

While I have'shown several of the forms and applications of my invention I do not wish to be confined to the same as it may have a wider application and may be em bodied in difl'erent forms than here shown.

I aim in my claims to cover all modifications which do not involve a departure from the spirit and scope of my invention.

\Vhat I claim as new and desire to secure by Letters Patent is z- 1. A core for dynamo-electric machines comprising a plurality of main lamina and groups of special laminae arranged at inter- ,vals forming ventilating passageways, the

special laminae having overlapping openings adjacent respectively the outer and inner peripheries of the core.

'2. In a laminated core for dynamo-electric machines, a plurality of main toothed laminae and a group of adjacent llat lamime. having teeth longer and narrower than the teeth of the core .so as to form deep slots atthe periphery of the core, said core being provide with ventilating passageways communicating with said deep slots.

3. In a toothed laminated core for dynamo-electric machines, a plurality of main laminae slotted to receive conductors, and a group of adjacent laminae having slots deeper and Wider than the slots of the main laminae, said core being provided with axial ventilating passageways and other passageways connecting said axial passageways with said deep slots.

4. A core for dynamo-electric machines, coin rising main lamime slotted to receive con actors, and special lamina formed to permit ventilation, said special laminae comprising a group of laminae having slots Within the body of the core and'slotted at the periphery to receive conductors, and a group of lamimehaving slots extending inward fronrthe periphery and over-lapping the slots of the other special laminae.

5. A core for dynamo-electric machines comprising main lamime slotted to receive conductors, a groupIot' special laminae having deeper slots and narrower teeth than the main laminae, and a group of laminze slotted to receive. armature conductors and having slots in the body of the core and overlapping the deep slots of thc first group of special la in inn.

In testimony whereof I ailix my signa ture, in the presence of two witnesses.

WALTER J. RICHARDS.

Witnesses v An'rnnn F. hwrs; Gno. B. 5011mm. 

